LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

95 misfire/no power

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Old Sep 8, 2014 | 08:10 PM
  #1  
Eddie95z's Avatar
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95 misfire/no power

Okay, replaced motor, new wires, plugs and opti, cleaned and tested injectors, replaced FPR , filter and fuel pump, have 44 psi... car idles okay, feels like it has a lite miss, but as soon as i put it in gear it starts missing rally bad, if i try to drive it, it acts like it's out of time, no power, valves rattling popping out exhaust... I'm about ready for the match and gasoline test......
Old Sep 8, 2014 | 08:21 PM
  #2  
Kevin Blown 95 TA's Avatar
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Re: 95 misfire/no power

Start with the basics - connectors to all sensors, firing order, get it on the scanner if you have one and see what does/doesn't check in. A 95 is harder to screw up the opti, but it can be put on wrong - some here have done it. Valve adjustments all out of whack - vacuum leaks... Agree it sounds out of time related, but check the easy stuff first.
Old Sep 8, 2014 | 09:01 PM
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Re: 95 misfire/no power

See if it runs better if you unplug the MAF sensor.
Old Sep 8, 2014 | 09:49 PM
  #4  
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Re: 95 misfire/no power

i've had a few people say i need a 94 knock sensor for it i'm using the 95 sensor but my pcm is 94
Old Sep 8, 2014 | 09:51 PM
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Re: 95 misfire/no power

I'll go for either plug wires mis-routed or opti not indexed correctly.
Old Sep 8, 2014 | 10:49 PM
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Re: 95 misfire/no power

I had an issue with a brand new opti once where it wouldn't seat completely against the block. There was MAYBE 1-3 millimeters of space so I thought it was no big deal. It ran horribly and when I took the opti back off, I saw the rotor was grinding into the cap. Just another possibility.

Also I didn't see you mention coil or ICM in your replaced parts list. But I would check plug wire routing first then unplug the MAF (since it's easy).

Last edited by AdsoYo; Sep 14, 2014 at 04:30 PM.
Old Sep 9, 2014 | 10:21 AM
  #7  
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Re: 95 misfire/no power

Originally Posted by Eddie95z
i've had a few people say i need a 94 knock sensor for it i'm using the 95 sensor but my pcm is 94
93-95 all use the same knock sensor. Should have roughly 4,000 ohm resistance.

Does the fuel pressure hold up where it should be when you start driving the car?
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